fsr_efs(1M) fsr_efs(1M)
fsr_efs - filesystem reorganizer for EFS
/usr/etc/fsr_efs [-s] [-v] [-g] [-M] [-t seconds] [-f leftoff] [-m mtab]
/usr/etc/fsr_efs [-s] [-v] [-g] [-M] [efsdev | dir | file] ...
fsr_efs is applicable only to EFS filesystems.
fsr_efs improves the organization of mounted filesystems. The
reorganization algorithm operates on one file at a time, compacting or
otherwise improving the layout of the file extents (contiguous blocks of
file data) while simultaneously compacting the filesystem free space.
The following options are accepted by fsr_efs. The -m, -t, and -f
options have no meaning if any filesystems, directories, or files are
specified on the command line.
-m mtab Use this file for the list of filesystems to reorganize.
The default is to use /etc/mtab. This file must be in
mtab(4) format.
-t seconds How long to reorganize. The default is 7200 (2 hours).
-f leftoff Use this file instead of /var/tmp/.fsrlast to read the state
of where to start and as the file to store the state of
where reorganization left off.
-M Reorganize only the metadata.
-s Print fragmentation statistics only. The fragmentation
percentage reported is 100 divided by the average size of
contiguous storage in that category (%frag is file data,
%free is free space). Different files are considered noncontiguous.
-v Verbose. Print cryptic information about each file being
reorganized.
-g Print all output using syslog(3C). This is the default if
fsr_efs is not invoked on a tty. If fsr_efs is invoked on a
tty then output is printed to the tty by default.
The intended usage is to regularly run the fsr command which in turn
invokes fsr_efs when it encounters EFS filesystems. By default this is
done from crontab once per week.
When invoked with no arguments fsr_efs reorganizes all regular files in
all mounted filesystems. fsr_efs makes many cycles over /etc/mtab each
time making a single pass over each filesystem. A pass consists of three
sub-passes, the first of which organizes the filesystem metadata
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fsr_efs(1M) fsr_efs(1M)
(directories and indirect extents) to improve fsck performance, the
second of which compacts files to improve performance, and the last of
which de-fragments filesystem free space. The first fsr_efs pass in this
mode does only the first sub-pass. It runs for up to two hours after
which it records the filesystem where it left off, so it can start there
the next time. This information is stored in the file /var/tmp/.fsrlast.
If the information found here is somehow inconsistent or out of date it
is ignored and reorganization starts at the beginning of the first
filesystem found in /etc/mtab.
fsr_efs can be called with one or more arguments naming filesystems
(block or character device name), directory hierarchies, and files to
reorganize. In this mode fsr_efs does not read or write
/var/tmp/.fsrlast nor does it run for a fixed time interval. It makes
one pass through each specified regular file, all regular files in each
specified filesystem and all regular files in each specified directory
hierarchy. When descending a directory hierarchy fsr_efs reorganizes
each regular file before descending into subdirectories. A command line
name referring to a symbolic link (except to a file system device), FIFO,
or UNIX domain socket generates a warning message, but is otherwise
ignored. While traversing the filesystem or directory hierarchy these
types of files are silently skipped.
/etc/mtab contains default list of filesystems to reorganize.
/var/tmp/.fsrlast records the state where reorganization left off.
fsr(1M), crontab(1), fsck(1M), mkfs(1M), ncheck(1M), efs(4), fsctl(7).
An entry in /etc/mtab or the file specified using the -m option must have
the rw option specified, for example:
/dev/root / efs rw 0 0
If this option is not present, then fsr_efs skips the filesystem
described by that line. If this option is not present, make sure that it
is present in the corresponding line in /etc/fstab so that it will appear
in /etc/mtab when the filesystem is mounted. See the fstab(4) and
mtab(4) reference pages for more details.
fsr_efs is a memory intensive program, and consumes memory proportional
to the number of file and directory inodes in the largest filesystem in
the system. Running fsr_efs on a filesystem with 500,000 inodes, for
example, can require 40 to 50 megabytes of main memory.
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